docs(callbacks): improved godocs for ContractKeeper state reversion (backport #4516)

[mergify]

This is an automatic backport of pull request #4516 done by Mergify.
Cherry-pick of 7985bbd has failed:

On branch mergify/bp/release/v7.3.x/pr-4516
Your branch is up to date with 'origin/release/v7.3.x'.

You are currently cherry-picking commit 7985bbd2.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   docs/middleware/callbacks/interfaces.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   modules/apps/callbacks/types/expected_keepers.go

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[srdtrk]

Had to backport this to 7.3.x to update the docs since I think docs will continue to be maintained here